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Finding the Fourth Proportional to 687.72, 949.02 and 422.11

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Solution

The fourth proportional to 687.72, 949.02 and 422.11 is: 582.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.72 : 949.02 = 422.11 : x
  2. Step 2: Convert to fraction form
    687.72/949.02 = 422.11/x
  3. Step 3: Cross multiply
    687.72x = 949.02 × 422.11
  4. Step 4: Simplify right side
    687.72x = 400,590.44
  5. Step 5: Solve for x
    x = 400,590.44/687.72
  6. Step 6: Final answer
    x = 582.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.